Signal Pest Signal Pests combination of abilities and power/toughness make it a decent fit in any deck that needs attackers that go unblocked
Karlach, Fury of Avernus is itself a red commander, but with the added benefit of background as your second commander
Throw everything you've got at the enemy with Ashling's light guiding the way, summoning massive Elementals at a discount with splashy battlefield entry effects
Balduvian War-Makers could easily show up in a David Cronenberg film
Simply tap Arcum and swap those tokens out for a Portal to Phyrexia, The One Ring, or even a Myr Battlesphere, and make even more Artifact Creatures to sacrifice again later
Six mana is a ton and you really dont want to play this until youre at seven, but I think people are sleeping a little on the power and versatility of this creature